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    <dt><a href="library/re.html#re.X">X (in module re)</a></dt>
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    <dt><a href="library/xdrlib.html#index-0">XDR</a>, <a href="library/pickle.html#index-1">[1]</a></dt>
    <dt><a href="library/xdrlib.html#module-xdrlib">xdrlib (module)</a></dt>
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    <dt><a href="library/htmlparser.html#index-0">XHTML</a></dt>
    <dt><a href="library/xml.dom.html#xml.dom.XHTML_NAMESPACE">XHTML_NAMESPACE (in module xml.dom)</a></dt>
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    <dt>xor</dt>
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    <dt>xrange</dt>
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      <dt><a href="library/types.html#index-2">built-in function</a></dt>
      <dt><a href="library/stdtypes.html#index-21">object</a>, <a href="library/stdtypes.html#index-28">[1]</a></dt>
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